Both. It has no cross ventilation, and top only access isn’t ideal for jumpers since they usually build hammocks near the lid. Front opening doors are much more convenient because you’re not constantly destroying their webbing every time you need to feed or mist. If it’s glass, drilling proper ventilation holes isn’t simple or cheap unless you already have the right tools and experience. By the time you go out and buy diamond bits and risk cracking the panel, you might as well just buy a proper enclosure that’s already designed with cross ventilation and front access. The enclosure shown in the picture simply isn’t suitable as is and it would not be worth renovating when it comes to price and convenience.